/* * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation. * * Copyright (C) 2010 John Crispin <blogic@openwrt.org> * Copyright (C) 2010 Thomas Langer <thomas.langer@lantiq.com> */ #include <linux/interrupt.h> #include <linux/ioport.h> #include <linux/sched.h> #include <linux/irqdomain.h> #include <linux/of_platform.h> #include <linux/of_address.h> #include <linux/of_irq.h> #include <asm/bootinfo.h> #include <asm/irq_cpu.h> #include <lantiq_soc.h> #include <irq.h> /* register definitions - internal irqs */ #define LTQ_ICU_IM0_ISR 0x0000 #define LTQ_ICU_IM0_IER 0x0008 #define LTQ_ICU_IM0_IOSR 0x0010 #define LTQ_ICU_IM0_IRSR 0x0018 #define LTQ_ICU_IM0_IMR 0x0020 #define LTQ_ICU_IM1_ISR 0x0028 #define LTQ_ICU_OFFSET (LTQ_ICU_IM1_ISR - LTQ_ICU_IM0_ISR) /* register definitions - external irqs */ #define LTQ_EIU_EXIN_C 0x0000 #define LTQ_EIU_EXIN_INIC 0x0004 #define LTQ_EIU_EXIN_INC 0x0008 #define LTQ_EIU_EXIN_INEN 0x000C /* number of external interrupts */ #define MAX_EIU 6 /* the performance counter */ #define LTQ_PERF_IRQ (INT_NUM_IM4_IRL0 + 31) /* * irqs generated by devices attached to the EBU need to be acked in * a special manner */ #define LTQ_ICU_EBU_IRQ 22 #define ltq_icu_w32(m, x, y) ltq_w32((x), ltq_icu_membase[m] + (y)) #define ltq_icu_r32(m, x) ltq_r32(ltq_icu_membase[m] + (x)) #define ltq_eiu_w32(x, y) ltq_w32((x), ltq_eiu_membase + (y)) #define ltq_eiu_r32(x) ltq_r32(ltq_eiu_membase + (x)) /* our 2 ipi interrupts for VSMP */ #define MIPS_CPU_IPI_RESCHED_IRQ 0 #define MIPS_CPU_IPI_CALL_IRQ 1 /* we have a cascade of 8 irqs */ #define MIPS_CPU_IRQ_CASCADE 8 #if defined(CONFIG_MIPS_MT_SMP) || defined(CONFIG_MIPS_MT_SMTC) int gic_present; #endif static int exin_avail; static struct resource ltq_eiu_irq[MAX_EIU]; static void __iomem *ltq_icu_membase[MAX_IM]; static void __iomem *ltq_eiu_membase; static struct irq_domain *ltq_domain; int ltq_eiu_get_irq(int exin) { if (exin < exin_avail) return ltq_eiu_irq[exin].start; return -1; } void ltq_disable_irq(struct irq_data *d) { u32 ier = LTQ_ICU_IM0_IER; int offset = d->hwirq - MIPS_CPU_IRQ_CASCADE; int im = offset / INT_NUM_IM_OFFSET; offset %= INT_NUM_IM_OFFSET; ltq_icu_w32(im, ltq_icu_r32(im, ier) & ~BIT(offset), ier); } void ltq_mask_and_ack_irq(struct irq_data *d) { u32 ier = LTQ_ICU_IM0_IER; u32 isr = LTQ_ICU_IM0_ISR; int offset = d->hwirq - MIPS_CPU_IRQ_CASCADE; int im = offset / INT_NUM_IM_OFFSET; offset %= INT_NUM_IM_OFFSET; ltq_icu_w32(im, ltq_icu_r32(im, ier) & ~BIT(offset), ier); ltq_icu_w32(im, BIT(offset), isr); } static void ltq_ack_irq(struct irq_data *d) { u32 isr = LTQ_ICU_IM0_ISR; int offset = d->hwirq - MIPS_CPU_IRQ_CASCADE; int im = offset / INT_NUM_IM_OFFSET; offset %= INT_NUM_IM_OFFSET; ltq_icu_w32(im, BIT(offset), isr); } void ltq_enable_irq(struct irq_data *d) { u32 ier = LTQ_ICU_IM0_IER; int offset = d->hwirq - MIPS_CPU_IRQ_CASCADE; int im = offset / INT_NUM_IM_OFFSET; offset %= INT_NUM_IM_OFFSET; ltq_icu_w32(im, ltq_icu_r32(im, ier) | BIT(offset), ier); } static int ltq_eiu_settype(struct irq_data *d, unsigned int type) { int i; for (i = 0; i < MAX_EIU; i++) { if (d->hwirq == ltq_eiu_irq[i].start) { int val = 0; int edge = 0; switch (type) { case IRQF_TRIGGER_NONE: break; case IRQF_TRIGGER_RISING: val = 1; edge = 1; break; case IRQF_TRIGGER_FALLING: val = 2; edge = 1; break; case IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING: val = 3; edge = 1; break; case IRQF_TRIGGER_HIGH: val = 5; break; case IRQF_TRIGGER_LOW: val = 6; break; default: pr_err("invalid type %d for irq %ld\n", type, d->hwirq); return -EINVAL; } if (edge) irq_set_handler(d->hwirq, handle_edge_irq); ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_C) | (val << (i * 4)), LTQ_EIU_EXIN_C); } } return 0; } static unsigned int ltq_startup_eiu_irq(struct irq_data *d) { int i; ltq_enable_irq(d); for (i = 0; i < MAX_EIU; i++) { if (d->hwirq == ltq_eiu_irq[i].start) { /* by default we are low level triggered */ ltq_eiu_settype(d, IRQF_TRIGGER_LOW); /* clear all pending */ ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_INC) & ~BIT(i), LTQ_EIU_EXIN_INC); /* enable */ ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_INEN) | BIT(i), LTQ_EIU_EXIN_INEN); break; } } return 0; } static void ltq_shutdown_eiu_irq(struct irq_data *d) { int i; ltq_disable_irq(d); for (i = 0; i < MAX_EIU; i++) { if (d->hwirq == ltq_eiu_irq[i].start) { /* disable */ ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_INEN) & ~BIT(i), LTQ_EIU_EXIN_INEN); break; } } } static struct irq_chip ltq_irq_type = { "icu", .irq_enable = ltq_enable_irq, .irq_disable = ltq_disable_irq, .irq_unmask = ltq_enable_irq, .irq_ack = ltq_ack_irq, .irq_mask = ltq_disable_irq, .irq_mask_ack = ltq_mask_and_ack_irq, }; static struct irq_chip ltq_eiu_type = { "eiu", .irq_startup = ltq_startup_eiu_irq, .irq_shutdown = ltq_shutdown_eiu_irq, .irq_enable = ltq_enable_irq, .irq_disable = ltq_disable_irq, .irq_unmask = ltq_enable_irq, .irq_ack = ltq_ack_irq, .irq_mask = ltq_disable_irq, .irq_mask_ack = ltq_mask_and_ack_irq, .irq_set_type = ltq_eiu_settype, }; static void ltq_hw_irqdispatch(int module) { u32 irq; irq = ltq_icu_r32(module, LTQ_ICU_IM0_IOSR); if (irq == 0) return; /* * silicon bug causes only the msb set to 1 to be valid. all * other bits might be bogus */ irq = __fls(irq); do_IRQ((int)irq + MIPS_CPU_IRQ_CASCADE + (INT_NUM_IM_OFFSET * module)); /* if this is a EBU irq, we need to ack it or get a deadlock */ if ((irq == LTQ_ICU_EBU_IRQ) && (module == 0) && LTQ_EBU_PCC_ISTAT) ltq_ebu_w32(ltq_ebu_r32(LTQ_EBU_PCC_ISTAT) | 0x10, LTQ_EBU_PCC_ISTAT); } #define DEFINE_HWx_IRQDISPATCH(x) \ static void ltq_hw ## x ## _irqdispatch(void) \ { \ ltq_hw_irqdispatch(x); \ } DEFINE_HWx_IRQDISPATCH(0) DEFINE_HWx_IRQDISPATCH(1) DEFINE_HWx_IRQDISPATCH(2) DEFINE_HWx_IRQDISPATCH(3) DEFINE_HWx_IRQDISPATCH(4) #if MIPS_CPU_TIMER_IRQ == 7 static void ltq_hw5_irqdispatch(void) { do_IRQ(MIPS_CPU_TIMER_IRQ); } #else DEFINE_HWx_IRQDISPATCH(5) #endif #ifdef CONFIG_MIPS_MT_SMP void __init arch_init_ipiirq(int irq, struct irqaction *action) { setup_irq(irq, action); irq_set_handler(irq, handle_percpu_irq); } static void ltq_sw0_irqdispatch(void) { do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ); } static void ltq_sw1_irqdispatch(void) { do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ); } static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id) { scheduler_ipi(); return IRQ_HANDLED; } static irqreturn_t ipi_call_interrupt(int irq, void *dev_id) { smp_call_function_interrupt(); return IRQ_HANDLED; } static struct irqaction irq_resched = { .handler = ipi_resched_interrupt, .flags = IRQF_PERCPU, .name = "IPI_resched" }; static struct irqaction irq_call = { .handler = ipi_call_interrupt, .flags = IRQF_PERCPU, .name = "IPI_call" }; #endif asmlinkage void plat_irq_dispatch(void) { unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM; unsigned int i; if ((MIPS_CPU_TIMER_IRQ == 7) && (pending & CAUSEF_IP7)) { do_IRQ(MIPS_CPU_TIMER_IRQ); goto out; } else { for (i = 0; i < MAX_IM; i++) { if (pending & (CAUSEF_IP2 << i)) { ltq_hw_irqdispatch(i); goto out; } } } pr_alert("Spurious IRQ: CAUSE=0x%08x\n", read_c0_status()); out: return; } static int icu_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw) { struct irq_chip *chip = <q_irq_type; int i; if (hw < MIPS_CPU_IRQ_CASCADE) return 0; for (i = 0; i < exin_avail; i++) if (hw == ltq_eiu_irq[i].start) chip = <q_eiu_type; irq_set_chip_and_handler(hw, chip, handle_level_irq); return 0; } static const struct irq_domain_ops irq_domain_ops = { .xlate = irq_domain_xlate_onetwocell, .map = icu_map, }; static struct irqaction cascade = { .handler = no_action, .name = "cascade", }; int __init icu_of_init(struct device_node *node, struct device_node *parent) { struct device_node *eiu_node; struct resource res; int i, ret; for (i = 0; i < MAX_IM; i++) { if (of_address_to_resource(node, i, &res)) panic("Failed to get icu memory range"); if (request_mem_region(res.start, resource_size(&res), res.name) < 0) pr_err("Failed to request icu memory"); ltq_icu_membase[i] = ioremap_nocache(res.start, resource_size(&res)); if (!ltq_icu_membase[i]) panic("Failed to remap icu memory"); } /* the external interrupts are optional and xway only */ eiu_node = of_find_compatible_node(NULL, NULL, "lantiq,eiu-xway"); if (eiu_node && !of_address_to_resource(eiu_node, 0, &res)) { /* find out how many external irq sources we have */ exin_avail = of_irq_count(eiu_node); if (exin_avail > MAX_EIU) exin_avail = MAX_EIU; ret = of_irq_to_resource_table(eiu_node, ltq_eiu_irq, exin_avail); if (ret != exin_avail) panic("failed to load external irq resources\n"); if (request_mem_region(res.start, resource_size(&res), res.name) < 0) pr_err("Failed to request eiu memory"); ltq_eiu_membase = ioremap_nocache(res.start, resource_size(&res)); if (!ltq_eiu_membase) panic("Failed to remap eiu memory"); } /* turn off all irqs by default */ for (i = 0; i < MAX_IM; i++) { /* make sure all irqs are turned off by default */ ltq_icu_w32(i, 0, LTQ_ICU_IM0_IER); /* clear all possibly pending interrupts */ ltq_icu_w32(i, ~0, LTQ_ICU_IM0_ISR); } mips_cpu_irq_init(); for (i = 0; i < MAX_IM; i++) setup_irq(i + 2, &cascade); if (cpu_has_vint) { pr_info("Setting up vectored interrupts\n"); set_vi_handler(2, ltq_hw0_irqdispatch); set_vi_handler(3, ltq_hw1_irqdispatch); set_vi_handler(4, ltq_hw2_irqdispatch); set_vi_handler(5, ltq_hw3_irqdispatch); set_vi_handler(6, ltq_hw4_irqdispatch); set_vi_handler(7, ltq_hw5_irqdispatch); } ltq_domain = irq_domain_add_linear(node, (MAX_IM * INT_NUM_IM_OFFSET) + MIPS_CPU_IRQ_CASCADE, &irq_domain_ops, 0); #if defined(CONFIG_MIPS_MT_SMP) if (cpu_has_vint) { pr_info("Setting up IPI vectored interrupts\n"); set_vi_handler(MIPS_CPU_IPI_RESCHED_IRQ, ltq_sw0_irqdispatch); set_vi_handler(MIPS_CPU_IPI_CALL_IRQ, ltq_sw1_irqdispatch); } arch_init_ipiirq(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ, &irq_resched); arch_init_ipiirq(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ, &irq_call); #endif #if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC) set_c0_status(IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5); #else set_c0_status(IE_SW0 | IE_SW1 | IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5); #endif /* tell oprofile which irq to use */ cp0_perfcount_irq = irq_create_mapping(ltq_domain, LTQ_PERF_IRQ); /* * if the timer irq is not one of the mips irqs we need to * create a mapping */ if (MIPS_CPU_TIMER_IRQ != 7) irq_create_mapping(ltq_domain, MIPS_CPU_TIMER_IRQ); return 0; } unsigned int get_c0_compare_int(void) { return MIPS_CPU_TIMER_IRQ; } static struct of_device_id __initdata of_irq_ids[] = { { .compatible = "lantiq,icu", .data = icu_of_init }, {}, }; void __init arch_init_irq(void) { of_irq_init(of_irq_ids); }